JLS : I think the current image is fine, thanks. For those who will tell me "it looks too much like a Fazrah" : It IS a Fazrah pirate captain.
The pirates have no specific race : it's a mix of oxygen breather races (including humans).
Here is the troop infantry picture :
Stone mill : What's the problem with ice planets ? I write somewhere that pirates were used to hiding in frozen, desert worlds, where nobody can annoy them. There is already lots of rock races, I wanted to create something different.